My DD was just like this and still is - she rarely cries - people at MG always comment they have never heard her cry, I waited and expected some sort of sleep regression but it never happened she continued to sleep all night now 8 months. Her weight gains have always been great so although at 12 weeks I was told I should wake her I never did. She is a very happy baby, apparently I was the same and DH was very placid too. I have to say though as a first time mum at times it has worried me the sleeping (people say that night wakings occur around learning to do new things so I was worried she wasn't progressing correctly - she was in a brace for hips so has been slow to do some things) and the fact nothing bothers her (first swimming lesson said they had never seen such a relaxed baby but what I wanted was a reaction). At MG it is always "but DD is such an easy baby" whenever I suggest anything. I am not worried about her anymore, have accepted that she is just a chilled little girl and just wanted to reply to say I understand how it can be worrying when a baby doesn't do what is said to be "normal" for their age even when it is quite a good thing like not crying much and sleeping overnight. Also I have to admit that sometimes seeing her upset makes me happy for a second because I am seeing a reaction.